Six Sigma approach is based on decreasing defects and variations in the products and processes, and it provides important benefits to healthcare organizations. This study aims to identify managers’ opinions, who work in private healthcare organizations, about the reasons behind not using Six Sigma in their organizations. The research was performed between December 2016 and March 2018 in private healthcare organizations (private hospitals and medical centers) operating in Turkey and not using Six Sigma approach. Data were collected from managers, who have knowledge about Six Sigma, through using surveys. In this study, survey methodology was used to collect data. According to the results, the biggest barrier related to not using Six Sigma is based on the lack of knowledge about Six Sigma. The other important barrier about the diffusion of Six Sigma within this organizations is related to the lack of support from top management and leaders. Another finding about the reasons of not applying Six Sigma approach is that there is not a statistically significant difference among managers in terms of their managerial position. In order to overcome the lack of knowledge about Six Sigma, it is advised that managers should take steps in the direction of promoting Six Sigma within their current organization, and provide necessary support and leadership about the process.

Six Sigma is a statistics-based approach focusing on minimizing defects and variations in prod-ucts and processes. Although it is used generally in production-based businesses, Six Sigma has been used in service sector businesses in the recent years as well. The aim of this study is to de-termine healthcare and banking sector managers’ perceptions related to Six Sigma, and compare healthcare managers and banking managers in terms of their opinions about six sigma. The study was done between February 2016 and October 2016 in private healthcare organizations and pri-vate banks operating in Turkey. The intended population of the study involves the managers working in these organizations. To compare perceptions of healthcare sector managers and bank-ing sector managers, Mann Whitney-U test was used. According to the statistical tests per-formed, there is not any statistically significant difference between healthcare sector managers and banking sector managers in terms of their view about Six Sigma. However, managers from the both sectors noted that Six Sigma could provide important advantages to their organizations. This result was considered as important because it indicates that Six Sigma can offer benefits for different and distinct parts of service sector, such as banking and healthcare.